Thanks to HubCity, I am able to provide some of the pages he used to maintain of the reports from the epic fanfest known as Animania IV, which took place in early August 1995.
(Not) Complete history of Animania events
including those since Animania IV
The Animania IV Trip Theme
as sung by the group accompanied by the Animaniacs Orchestra
conducted by Richard Stone
Press release from Warner Bros. Animation
An Account from the Inside,
by Andy "Chance" Hill
Originally posted to related Usenet newsgroups
In the words of those who were there:
Rex "FuzzyTiger" Wheeler's report
Ron "Keeper" O'Dell's report
Marilyn "pinkinia" Gore's report
Bryan "wbwolf" Chaney's report
Jay "Splutter" Maynard's report
Kevin "Kokopelli" Pezzano's report
Kim "Yakko's Babe" Robarts' report
Some comments from Tom Ruegger
(who, as luck would have it, created Animaniacs in the first place)
A transcription of the story that ran on E! News Daily on August 29, 1995, or the actual video (links to YouTube, opening in new window).
The picture (with identification key) of the Animania IV group, taken on the Warner Bros. studio lot. It's only a 60K JPEG download.